package com.heima.app.gateway.filter;

import com.heima.app.gateway.utils.AppJwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;
@Component
@Slf4j
public class AuthorizeFilter implements GlobalFilter, Ordered {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1.获取请求和响应数据
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        //2.判断是否为登录的请求
        if(request.getURI().getPath().contains("/login")){
            //2.1是登录，放行
            return chain.filter(exchange);
        }
        //3.获取token
        String token = request.getHeaders().getFirst("token");
        //4.判断token是否存在
        if(StringUtils.isBlank(token)){
            //设置响应状态码401
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        try {
            //5.判断token是否有效
            Claims claims = AppJwtUtil.getClaimsBody(token);
            //5.1获取当前token状态
            int result = AppJwtUtil.verifyToken(claims);
            if(result == 1 || result == 2){
                //5.2过期了，设置状态吗为401并返回
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }
        } catch (Exception e) {
            e.printStackTrace();
            //如果出现异常同样返回401
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        //6.放行
        return chain.filter(exchange);
    }
    //过滤器优先级
    @Override
    public int getOrder() {
        return 0;
    }
}
